#define _CRT_SECURE_NO_WARNINGS 1

#include<vector>
#include<iostream>

using namespace std;

void test1()
{
	vector<int> v1 = { 10, 20, 30, 40, 50 };
	v1.insert(v1.begin(), 1);
	for (auto e : v1)
	{
		cout << e << ' ';
	}
	cout << endl;
	v1.insert(v1.begin() + 3, 1);
	for (auto e : v1)
	{
		cout << e << ' ';
	}
	cout << endl;
}

int main()
{
	test1();

	return 0;
}